PBS says that beginning next week, it will be distributing a free, two-hour Frontline documentary on US Presidential candidates John McCain and Barack Obama through the iTunes Store. Called The Choice 2008, it should be posted on October 15th, and remain available through November. PBS describes the series as a personal and political biography of the two opposing candidates, meant to help voters get to know each candidate prior to the election. The documentary should also be available through YouTube and special on-demand TV channels.